She called the pair’s relationship the “sweetest thing ever”, adding that “no one said it was easy trying to be a mother to a kid you didn't have”.

“I'm super thankful for her because when she [Riley] visits her dad she feeds her, takes care of her, buys her gifts, and basically takes care of her like her own,” she wrote.

Ms Nicole urged other families who might be in a similar situation to try and make more of an effort to get along.

“Why do all these mums act so spiteful and jealous towards the other women?” she questioned.

“So when there is someone trying, don't push them away! Because they don’t need the drama, they WILL leave and then you’re stuck with someone who is the ‘evil step mum’. Yes they exist! I see them everywhere!

“A kid can have two mums because in my eyes the more people that love her - I'm happy!!! I would never make her feel like an outsider, I'm extremely thankful for this girl.

“Ladies grow up and focus on being a good mum not worrying about what is on your baby daddy's girlfriend’s Facebook and Instagram while your kid is right next up you.”

In a follow-up post, she explained that she was “blown away” by the reaction to her post, with many other stepmothers also sharing on her timeline their own experiences.